Code point
U+300A
Glyph appearance depends on your fonts.
U+300A
PsU+300A LEFT DOUBLE ANGLE BRACKET is a Unicode 16.0.0 character in the Open Punctuation category. It belongs to the CJK Symbols and Punctuation block.
Choose the representation you need, then copy its value.
U+300A
12298
《
《
E3 80 8A
300A
0000300A
%E3%80%8A
\u300A
\u300A
\u300A
\300A